Electric furnace for heating, annealing, and melting metallic material.



M; FOSSAH.

ELL-26mm FUHNACE POP. HEAHNG, ANNE/mme, AND MENING METALL-lc MATERIAL.

AFPLICATRON FLED MAR. 6, i919,

vtion of the furnace; Fig. 2O

. UNITED smarts PATENT OFFICE.

MARIO FOSSATI, 0F TURIN, ITALY, ASSIGNOR TO SOCIETA ANONIMA STABILIMENTI BIAK, OF- TURIN, ITALY, A COMPANY OF ITALY. y

ELECTRIC FURNACE FOR HEATING, ANNEALING, AND MELTING METALLIC MATERIAL.

Specification of Letters Patent.

Patenteunov. 1s, 1919.`

Application filed March 6, 1919. Serial No. 230,884.

To all whom t may concern:

Be it 'known that I, MARIO FossATI, subject of the King of Italy, and resident of Turin, Italy, have 'invented certain new and useful Improvements in Electric Furnaces 'for Heating, Annealing, and Melting Metallic Materials, specification.

This invention relates to an induction and resistance electric furnace consisting of a. plurality of like sections, this -furnace'beof Whichthe following is a -in`g designed 'for heating, annealing and melting metals and materials of any kind.

The accompanying drawing shows by way of example a construction of the furnace according to this invention; Figure l is a front view of one of the sections forming the furnace; Fig. 2 is the central section of a por- 3 is a perspective diagram showing the conductor wnnections, and Fig. Ishows an arrangement for adjusting the insulating spaces or gaps between the furnace section elements.

As shown onv the drawing, thev furnace comprises a number of sections l having' an internal hollow space and provided with flanges 2' which are assembled by means of bolts 3 or the like, said sections being arranged side by side with their hollow spaces located in alinement witheach other so as to form the furnace chamber 4.'

Sections'l are made of magnetic material and are provided with holes in which are inserted conductors 5 having high olnnic resistance, said conductors being electrically4 Ainsulated from sections sulatingl sleeves 8. Conductors 5 are 1n the l by means of ini 1 form of bars arranged longitudinally, that is to say, parallel to the furnace axis, and connected so as to form one or more completeturns.

y The construction illustrated on the drawing comprises six conduetors! vhich form three separate turns as shown by Fig. 3, each of said conductors being connected by ope end withone of the feeding wires of a three-phase circuit, while the three opposite ends are connected together.I

The arrangement and connections of conductors may' be different from that `illustrated on the drawing. to suit clrcumstanees,

land the character of feeding current used;

' in anye'ase, as the conductors form complete turns, by, feeding'them with an alternating combination of' fiuxes may be such as Vto' neutralize at each time the mutual induc-y tion of conductors -while permitting' the utilization of currents induced in the magnetic Ycircuit .by current fiowing through said conductors. l

Such a result may be obtained by the arrangement of circuits described in connection with Fig. 3 of the drawing, but the same may also be obtained by other suitable arrangements. i

Each section of the furnace may consist of two elements arranged close together but.

not in Contact, as shown by Fig. l., so as to leave a space or gap. 6 between the facing surfaces of said section elements, said gaps beingeither left open or filled with alayer of refractory material further, if desired, said gaps may have an adjustable thickness.

Fig. 4 shows an arrangement for adjusting the thickness of the air gaps. In said arrangement the upper elements of sections 1 are connectedtogether by bars 9 insulated therefrom and the lower elements of the' same sections are connected together by bars l0; appropriatedevices such as screws 1l are used 4to adjust the air space or gap between the opposed surfaces of said section elements. l

The several sections 1 are mounted side by side at such a. distance from each other as to leave a suitable space or gap 7 between them, 'this gap being open to air or filled with insulating material, asabove described;

@L imma-ce acrif; iuna for heating, :ui-

iiwmllic materizs n phififiity of sections Vi mateia havin-2 an opene side by side 'to 'provide a v ci?. .f 1d sections forming an sef.. circuit left theyeb@ ciers to and insulated tiieie'i-Om, mi Mecu'frent being fed "co Said Conductas to Se. *D 'neat dveopiment by fesiStzuifiz@ u l idR/tais and bv indi/tio ut@ sand sectcnm.

4. All electricA fummo@ 01? heating? :1n- .a-iigand melting iuetaic*matei'inls of kind, compiising.. plurality of sepa fK sections made of mangiati@ iimteai yci thi; same consisting of portions proifiGiDO adjacent', sui- L; a @number and havin' ugr spaces uw beiweeii which insuia 1d conductors pasimig through said section portions and insuatefl theiefi'fam, :in electric. @mirent being i'e gud conductors i0 qu@ 'use to heat,devaiopmenz by i'ssisf of said conductors am. by indution .fd Sections.

eisebiic mna for heating', uw and meiting iHH-allie materials of :my kind, Coiupi'ising a, plurality of sepaiage @wi/ions made O magnetic inufeiini @zich of the sume congisting of poi'tions providiup; a ciizuibei' und having-adjacent surfaces betwe i; which insulating spaces are left, maar@ im' Varying the thickness of Suid in Suin'ing; spaces, ami conductors passing durough said Section po'tioii amd. insulated "diere-from ibo give risa 'to heat devehpment bj resistance of said conductors and by i1iducion int-O said sections. i

vTurin5 Italy this 7th any QLQ.

RAG FCS SAT1 

